Lec2 Chemical Biology

Lec2 Chemical Biology - Biology 115, Human Biology:...

Info iconThis preview shows pages 1–19. Sign up to view the full content.

View Full Document Right Arrow Icon
Biology 115, Human Biology: Chemical Biology T. Bekyarova, January 2009
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Readings Chapter 2
Background image of page 2
Chemistry of Life Molecules that make up living things obey the same laws of chemistry as the non-living world
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Building blocks from large to small Matter is anything that has weight and takes up space Elements are the basic building blocks of matter that cannot be broken down by chemical means Atoms are the smallest units of an element that retain the element’s physical and chemical properties. These bond together to form molecules
Background image of page 4
Atoms have structure Protons, neutrons, etc. The number of protons determines the number of electrons i.e. atomic number` Number of electrons determines an element's chemical properties.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Atoms Atom symbol Atomic mass Atomic number
Background image of page 6
Subatomic particles of atoms Neutrons have a neutral charge Protons are positively charged Neutrons and protons make up the nucleus Electrons are electrically charged and orbit around the nucleus
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Isotopes Isotopes are atoms that have the same atomic number but a different atomic mass because the number of neutrons differ Some isotopes are unstable i.e. radioactive By giving off subatomic particles, radioactive elements gradually change into other elements Radioactive isotopes are useful in dating old objects, imaging body organs and tissues through x-rays and killing cancer cells Radiation can be harmful by damaging cells and DNA and/or causing cancer
Background image of page 8
131 I—used to check the condition of the thyroid gland. PET—a way to aid a diagnosis Ability of radiation to kill cells is often applied to cancer cells.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What Elements Are We Made of?
Background image of page 10
Molecules & Compounds Formed by the interaction of atoms via their electron clouds A Compoun d is a substance made from two or more atoms and always has the same chemical formula A Molecule is the smallest particle of a compound that retains the chemical and physical properties of that compound Molecules can be made of the same atom or different atoms
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Ionic Bonds Occurs between particles that are charged (ions) Atoms in this type of bond donate or take on electrons Results in a stable outer shell
Background image of page 12
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 14
Covalent Compounds Covalent compounds are formed neutral atoms that share electrons Results in a stable outer shell
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 16
Background image of page 17

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Polar Molecules Result from unequal sharing of electrons
Background image of page 18
Image of page 19
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 66

Lec2 Chemical Biology - Biology 115, Human Biology:...

This preview shows document pages 1 - 19. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online